Demi Lovato

From Ariana Grande to Gigi Hadid, read all about these celebrities' encounters with ghosts!

While in Miami, Fla., for the Super Bowl, Lovato hopped onstage with Dan + Shay to perform their song "Speechless."

Find out how Demi did during her national anthem performance.

The pop star is NOT a fan.

Pop star Demi Lovato will reportedly remain in rehab until the end of the year.

Some of these transformations will make your head spin — or at least give you a laugh.